Small tip: when working with commercial split systems, the control voltage comes from the outdoor unit, which is the opposite of a residential system where the indoor unit created the control voltage. This is something to be aware of especially when working on a heat pump system and there’s an issue with defrost. In order to keep the auxiliary heat running, the outdoor compressor(s) need to be manually disabled via the contactor wire. . . . #hvac #hvaclife #hvactechnician #hvacservice #hvacinstall #hvacrepair #hvacmaintenance #hvaccommercial #hvacsplitsystem #teachme

Posted by hvac_grammarian at 2021-04-06 19:47:22 UTC